Edward s



(No Model.)

E. S. BOYYNTON.

WRENCH.

No. 404,769. Patented June 4,1889.-

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UNITED STATES PATENT OEEICE.

EDWARD S. BOYNTON, OF NEW YORK, N. Y., ASSIGNOR TO THE CAMPBELL PRINTING PRESS AND MANUFACTURING COMPANY, OF SAME PLACE.

WRENCH.

SPECIFICATION forming part of Letters Patent No. 404,769, dated June 4, 1889. Application filed November 26, 1888. Serial No. 291,872. (No model.)

To aZZ whom it may concern,.-

Be it known that I, EDWARD S. BOYNTON, of the city of New York, in the county and State of New York, have invented a new and useful Improvement iu IVrenches, which invention is fully set forth and illustrated in the following specification and accompanying drawings.

The object of this invention is to provide means, in the well-known solid alligatorwrench, of' preventing tendency to crush any cylindrical object operated upon under considerable resistance to rotation.

The invention will first be described in detail and then particularly set forth in the claim. l

The most effective arrangement of the solid form of alligator-wrench has been found to be that of one plain smooth jaw forming a given angle with the opposite serrated or toothed jaw, with the serrations or teeth pointing at an angle inward, so that in the eifort to rotate it upon a pipeor other similar object the said pipe will slide upon the said smooth jaw until the teeth of the opposite jaw penetrate sufficiently to insure a firm hold; but under severe strain the tendency for a pipe to beI forced into the wedge-shaped opening often results in a crushing action, which constitutes a grave objection to this otherwise very efficient form of wrench.

This invention therefore consists in the introduction of au adjustable stop in the angle between the jaws, which may be so set for any 'given size of pipe to be operated on as to arrest its further entrance into the angle of the jaws when the teeth of the serrated jaws shall have penetrated sufficiently to obtain the desired hold.

In the accompanying drawings, Figure l is a side elevation, and Fig. 2 an edge elevation, of the complete wrench. Fig. 3 is a side elevation of a modified form.

In said figures, l indicates the main body of the wrench having formed upon it the serrated jaw 3 and the smooth jaw 4, making the proper angle with each other. A

screw 5 is threaded in the enlargement 6 on the body of the wrench, and is provided with a milled head 7 The dotted circles 8 and 9 s'how the largest and smallest objects to which the wrench may be applied, and the screw 5, as shown in full lines, operates against the further entrance of the larger object into the angle of the wrench and, as shown in dotted lines, similarly operates upon the smaller ob- `ect.

J The milled head 7 of the screw 5 is shown secured to said screw by a pin p. Such construction permits of the head end of the screw being entered from the angle .between the jaws, when the milled head can be pinned on as soon as the end of the screw fully enters the slot S in the body ofthe Wrench. By such construction the slot need not be made the full length of th'e screw, as would necessarily be the case if the milled head were not removable. Instead, however, of making a slot, or at best a very narrow one, the screw may be reversed and its milled head occupy the angle between the jaws and its adjustment be made so that the pipe will be abutted by the head instead of by the point of the screw, as shown at 7 in Fig. 3.

Having thus fully described my said Vi111- provement, as of my invention I claim- In combination with a wrench having a serrated jaw and an opposite plain jaw, forming a wedge-shaped opening between them, as 1, 3, and 4, an adjustable stop in the angle between the jaws, whereby said stop may be adjusted to any given diameter of object to be operated on, so as to permit of said object sliding on said smooth jaw until securely grasped by the teeth of the serrated jaw, and at that point to arrest the same from any further entrance into the angle of said jaws, thereby avoiding danger of the same being crushed, as set forth.

EDWARD S. BOYNTON.

Witnesses:

JOHN TULLY, FRANK L. ENTwIsTLE. 

